Author Archive | Jarrett

even with gps, we still need north

North arrowFrom a NYT article by Julia Frankenstein arguing that relying on narrative GPS for navigation ("turn left 1/4 mile") can atrophy your ability to remember maps of your city:

In one experiment, I had 26 residents of Tübingen, Germany, navigate a three-dimensional model of their hometown by wearing head-mounted displays. My team and I asked them to point to well-known locations around town not visible from their current perceived position.

Varying their viewing direction — facing north, facing east — we then assessed their pointing error. All participants performed best when facing one particular direction, north, and the pointing error increased with increasing deviation from north. In other words, by using knowledge gained from navigation to link their perceived position to the corresponding position on a city map, participants could easily retrieve the locations from their memory of city maps — which, after all, are typically oriented north.

To a spatial navigator like me, this is obvious.  But the sample must have included at least a few narrative navigators, people who prefer to navigate with directions rather than maps, and even these people have a sense of north that organizes their understanding of the city.

A great deal of navigational technology is designed and focus-grouped with people who don't like to think with maps.  Hertz's Neverlost GPS, for example, no longer allows me to pin north to the top of a map, as earlier versions did.  Instead the map rotates crazily every time I turn, which helps orient to my line of sight but undermines my ability to relate the map to any larger understanding of the city.  I understand that many people prefer the map to be oriented to their point of view, but in fact, we still seem to need the map with north at the top, because as Ms.Frankenstein showed, people have a better sense of what's where when facing that way.

All this comes back, as it often does, to transit maps.  Often it seems like transit maps are designed by people who don't like maps as information, though they may appreciate them as design. But maps are still important.  Spatial navigators like me can't navigate without them, and even narrative navigators have them in their brains, with a north-arrow.

to save time is to lengthen life

That was the slogan of this 1912 advertisement for the first segment of subway rapid transit to open in the Boston area, the Cambridge segment of the Red Line.  Thanks to the TRB History Committee.  

Red line ad

Yes, I know that slow, fun transit is supposed to make us enjoy the ride more, and the ride is part of life.  But if you're not riding for fun, wouldn't you rather get where you're going?

a good reason to (re)read jane jacobs

Death and LifeThe City Builder's Book Club is about to begin reading Jane Jacobs's seminal 1961 book, the Death and Life of Great American Cities.   

This is one of the few books that Absolutely Everyone Who Thinks About Cities Has Read, so if you haven't read it, (a) don't tell anyone, not even your partner or priest or dog, and (b) take this opportunity to read the book as commentary and discussion appears on the Book Club Blog, chapter by chapter. I'll be providing the opening commentary on Chapter 18, the main chapter on transportation.

Yes, I know, you lazy students can also just read the blog and forget reading the book (much as journalists prefer to interview me rather than read my book!) but believe me, you'll be the poorer for it.  Jacobs is one of the most readable writers ever on city planning, and even those who disagree her tend to acknowledge her brilliance as an observer of city life.

 

basics: the “new route” problem

When people think of a new transit need, they often jump prematurely to the idea that they need a new route.  This article of mine — linked to in Chapter 7 of my book — explains why this can be a bad idea.

today’s attack from reason.com

Tim Cavanaugh at Reason.com attacks me this morning for this post, in which I argued that redundancy in transit networks (as hailed by the Economist in their discussion of my book) often comes at the expense of overall service quantity and thus your ability to get where you're going:

… Walker speaks up on his blog, to explain that when he talks about reliability, he doesn’t mean you should actually let people provide a variety of approaches for taking customers where they want to go: 

"Massive redundancy" may be fine if you're a megacity, though even there, its effectiveness may be a feature of the peak that doesn't translate to the rest of the day.  Anywhere else, services need to work together as a network.  Even in London, New York, Paris, Hong Kong and Berlin, that's really what's happening. 

This is what happens when your mind is full of smart networks and transit-oriented growth. The proper word here is not “redundancy” but “competition.” To the owner of a taxi medallion or a member of the Transport Workers Union, minibuses, gypsy cabs, rolling chairs and pedicabs are all redundant, because you’re already providing all the service a customer could legitimately need. If some abuelita is stuck in the rain for 45 minutes waiting to make one of your smart connections, well, that just shows you need more money so the system can be more efficiently planned. 

Note the use of "competition" not as an idea but just as a mantra.  This last paragraph is so incoherent that I'm not even sure what I'm being accused of, so let me just clarify the question of competition.

The problem with encouraging multiple transit products to compete for the customer along the same path of travel is that transit's usefulness lies heavily in frequency (thus preventing 45 minute connections, for example), and frequency is an expensive resource that must be concentrated so that it can be made abundant.  To introduce competition among transit services going the same way is to undermine frequency — as in the increasingly discredited British model where people were required to let Joe's Red Bus go by because their ticket was good only on Jim's Blue Bus.   Earth to competition fantasists: Outside of the peak commute, people just want to get where they're going now, but they want this throughout the day, which means they want frequency.  Abundant frequency arises from concentrating and organizing a single pattern of service, not encouraging lots of different services to run on top of each other.

I have never opposed private sector competition.  There's obviously nothing wrong with taxis, pedicabs, etc competing with each other, and even competing with transit.  On the peak commute, transit is usually overcrowded and can benefit from others taking up some of the load (because peak transit service is so expensive).  But outside the peak commute, where frequency matters, nothing can compete with transit at its price point, once it's built up sufficient frequency.  Taxis and pedicabs and autorickshaws can still have a role (a) at other price-points and (b) in places where the geography prevents transit from offering attractive service.

Still, we need to be more critical of cases where we are spending public transit dollars on multiple services that compete with each other instead of adding up to the greatest possible mobility.  Competition fantasists imagine that when Joe's Red Bus and Jim's Blue Bus run on the same route, the customer is being empowered.  Actually, she's just being obstructed, because in most cases, what she wants is any bus, now.

quote of the week II: illusions of walkability

Pedestrians_lyndale-600x421

We are stuck in a narrative of a city being great and fabulous and walkable because it appears so (i.e. those sidewalks look pretty and nice, and I would walk down them if I felt like it and wasn’t driving to the store right now), not because it actually is.

— An unsigned but must-read post by PRAIRIEFORM

 The city of reference in the post is Minneapolis, but the point is a much broader and more nuanced one.

Pic: PRAIRIEFORM

 

quote of the week: snow removal priorities

“[Seattle's] snow and ice response plan is built around getting people to use public transportation.  Given our geography here, we would have to have 100 trucks [to cover the whole city], and at $150,000 to $200,000 a truck, that would be a foolish waste of money because they would sit most of the time. And they would sit for five years because it doesn’t snow that often. So we go with what we have.”

 – Seattle Director of Street Maintenance Steve Pratt

That's from a terrific (and funny) Atlantic article on snow removal, by Emily Badger.  (Seattle has only 30 snowplows in a city that passes some winters with no snow at all, and averages only 7 inches of snow per year.  It also has a traumatic memory of serious blizzards in 2008 and 2010, which I believe caused the coinage of the now-banal term snowpocalypse.)

 

the economist and the “redundancy” fallacy

Today's unsigned piece in the Economist "Democracy in America" blog picks up on Tom Vanderbilt's Slate item reviewing my book.  I'm certainly grateful for the publicity, though for the record, I do believe in pleasure!

But the Economist's writer ends his piece with a commonplace of old-inner-city thinking that can do real harm when taken outside those bounds:

Ultimately, what makes public transit work is massive redundancy: lots of different systems layered on top of each other, all running at high frequencies, providing you clear information on when the next one arrives. The world's best cities, New York, Paris, London, Hong Kong, Berlin, all do this pretty well. For cities that aspire to greatness, the road map doesn't seem so hard to follow.

"Lots of different systems layered on top of each other" begs the question of whether these systems are working together — for example by encouraging connections from one to the other — or simply duplicating each other.  That is the distinction that matters.  

Yes, if you're in "New York, Paris, London, Hong Kong and Berlin" you may perceive a layering of "redundant" services, but one of two very different things is happening:

  1. The services are truly redundant in the sense of duplicating (or even competing) but the demand is so intense that they're all full, so the duplication isn't much of a waste.  This is the case with many big-city commute markets, but often not with all-day patterns.
  2. The services are actually fitting together into an integrated network, through some mix of planned connectivity and complementarity.  An example of complementarity is the simultaneous presence of services in one corridor that differ in the speed/access tradeoff.  A major Manhattan avenue, for example, may have an "express" train stopping only every mile or less, a "local" train stopping less than every half-mile, and a bus on the surface stopping even more frequently.  That isn't redundancy unless the market isn't strong enough to support all three.

Praising these super-dense cities for "massive redundancy" sends exactly the wrong message to less-dense and smaller cities.  Tell them to plan for redundancy, when their markets are insufficiently developed, and they'll spread their resources out in tangles of overlapping services none of which are frequent or attractive enough to be worth waiting for.  This is the lesson of inner Sydney, discussed in Chapter 12 of my book.

You need massive agglomeration for true redundancy to work.  Without that, you dissipate service quality too much.  This was a key failing of the privatization of the British bus industry, which gave private companies control over transit planning and prohibited them from working together to create rational connective networks, by declaring that to be collusion.  The result was a generation of frustrated riders who had to let Jim's bus go by because they had a ticket for Joe's bus, even though the two bus lines together might add up to enough frequency to actually be useful.  The last Labour government finally removed this prohibition on "collusion," allowing simple, obvious, and mutually beneficial plans to go forward, like this one in Oxford.

"Massive redundancy" may be fine if you're a megacity, though even there, its effectiveness may be a feature of the peak that doesn't translate to the rest of the day.  Anywhere else, services need to work together as a network.  Even in London, New York, Paris, Hong Kong and Berlin, that's really what's happening.